Propagation characteristic and intraseasonal oscillation of the swell energy of the Indian Ocean
Propagation characteristic and intraseasonal oscillation of the swell energy of the Indian Ocean
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DOI：
10.1016/j.apenergy.2017.04.052
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发表时间：
2017-07
期刊：
影响因子：
11.2
通讯作者：
Chong-wei Zheng;C. Li
中科院分区：
文献类型：
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作者：
Chong-wei Zheng;C. Li
涌浪能量的传播特性对于涌浪发电、海浪预报、防灾减灾等应用具有重要意义，但目前对涌浪能量传播的研究还比较少。这项研究提出了一种新方法来展示膨胀能量的精确传播路径和速度以及季节内振荡。选择印度洋作为案例研究，使用45年（1957.09-2002.08）欧洲中期天气预报中心（ECMWF）再分析（ERA-40）波浪再分析数据集。主要结果如下。 （1）经验正交函数（EOF）分析和涌浪功率密度（WPD）6小时纬向平均值表明，印度洋涌浪能量具有明显但波动的东北传播特征。 (2) 西南印度洋涌浪能量大体向两个区域传播：主体沿NE—NNE向向斯里兰卡海域传播，小分支向圣诞岛海域传播。 (3) 南印度洋西风(SIOW)以西、斯里兰卡海域和圣诞岛海域的膨胀能量具有共同的准周振荡周期。涌浪能量需要大约 6 天的时间才能从 SIOW 西部传播到斯里兰卡和圣诞岛水域。六月至九月期间膨胀能量的传播速度比其他月份更快。
The propagation characteristics of swell energy are important for applications such as swell wave power generation, ocean wave forecasting, disaster prevention and reduction, etc. However, the study on the propagation of swell energy is still relatively rare. This study proposed a new method to exhibit the exact propagation route and speed and intraseasonal oscillation of swell energy. The Indian Ocean is selected as a case study, using the 45-year (1957.09–2002.08) European Centre for Medium-Range Weather Forecasts (ECMWF) Reanalysis (ERA-40) wave reanalysis dataset. The main results are as follows. (1) empirical orthogonal function (EOF) analysis and 6-hourly zonal averages of swell wave power density (WPD) show that the Indian Ocean swell energy has an obvious but fluctuating northeastward propagation. (2) The swell energy of the southwest Indian Ocean generally spreads to two regions: the main body propagates in a NE–NNE direction to Sri Lankan waters, while a small branch propagates to Christmas Island waters. (3) Swell energy in the west of the southern Indian Ocean westerly (SIOW), in Sri Lankan waters, and in Christmas Island waters share a common period of quasi-weekly oscillation. Swell energy takes ∼6 days to propagate from the west of the SIOW to Sri Lankan and Christmas Island waters. Swell energy propagates faster during June–September than in other months.